tokico struts, wheres the other piece

[ny-s14blacktop]

last year I baught some tunabe springs and this year I had enough money so I said wtf I will buy some decent struts since I know
i was suposed to upgrade the suspension and braking first, so I got my tokico d-spec adjustable struts for my car and they look good what can I say lol, but all that came with the struts is a key to adjust them, I feel like there should be a top piece to the strut,this might be a fuckin stupid question but am I missing something or are you suposed to use the stock top piece or what somebody please help me out there with some aftermarket tokico struts